Android Utils missing from opencv

[richwandell]

I am trying to convert a Bitmap to Mat and Mat back to Bitmap but everywhere I am finding this suggestions.

Mat mat = new Mat();    
Bitmap bmp32 = bmp.copy(Bitmap.Config.ARGB_8888, true);
Utils.bitmapToMat(bmp32, mat)

The "Utils" class seems to be missing from javacpp-presets:opencv:3.4.1-1.4.1

implementation 'org.bytedeco.javacpp-presets:opencv:3.4.1-1.4.1:android-arm', {
        exclude group: 'com.github.stephenc.findbugs', module: 'findbugs-annotations'
    }


    implementation 'org.bytedeco.javacpp-presets:opencv:3.4.1-1.4.1:linux-x86_64', {
        exclude group: 'com.github.stephenc.findbugs', module: 'findbugs-annotations'
    }
    implementation 'org.bytedeco.javacpp-presets:openblas:0.2.20-1.3', {
        exclude group: 'com.github.stephenc.findbugs', module: 'findbugs-annotations'
    }
    implementation 'org.bytedeco.javacpp-presets:openblas:0.2.20-1.3:linux-x86_64', {
        exclude group: 'com.github.stephenc.findbugs', module: 'findbugs-annotations'
    }

[saudet]

Done! Please try it out with 1.4.2-SNAPSHOT: http://bytedeco.org/builds/

[richwandell]

Thanks!

I am getting the following build errors. Any idea how I can resolve these?

[saudet]

That's just Gradle not supporting snapshots well. Use a dummy Maven project to download the artifacts first.

[saudet]

BTW, the Gradle team doesn't seem to care too much about snapshots at the moment, see: gradle/gradle#2882
https://discuss.gradle.org/t/maven-metadata-with-classifiers-fails-to-resolve-for-snapshots/20071

If you could let them know you need better Maven compatibility, that would be great!

[richwandell]

Thanks for the help! I got it working

[saudet]

FYI, here's another way: bytedeco/javacv#945 (comment)

[nofurylion]

Hi,
Build target : Android 21+
Language : Kotlin
My gradle :

implementation group: 'org.bytedeco', name: 'opencv', version: '4.1.0-1.5.1'
implementation group: 'org.bytedeco', name: 'opencv', version: '4.1.0-1.5.1', classifier: "android-arm"

When using Utils.bitmapToMat(param1, param2), the only available Utils are from package org.opencv.android. I cant find Utils from package org.bytedeco.opencv.android .

This lead to error since param2 will require org.opencv.core.Mat instead of org.bytedeco.opencv.opencv_core.Mat

I've tried rough casting it like param2 as org.opencv.core.Mat but it lead to error "unable to cast".

Are there any alternative way to convert bitmap to mat easily?
and also why package org.opencv.* still exist in the library? Is that how wrappers work?